View previous topic :: View next topic |
Author |
Message |
Gee-Pee Lifetime Member
Joined: Feb 10, 2005 Posts: 1951 Location: Mostly somewhere in Essex
|
Posted: Wed Apr 06, 2005 8:20 am Post subject: Speed Display |
|
|
I know that a car speedo is about 10% higher than a GPS display but is the GPS 100% accurate?
For instance if you use an external antenna is the refresh rate on iCN510 faster (therefore more accurate) than if I only use the attached antenna?
Can I really rely on the GPS displayed speed for road speed limits? i.e if my speedo is saying 77mph in a 70 mph limit but my Navman says OK you are only doing 70mph - which do I believe?
Any views or any experience, please.. _________________ Gee-Pee
Lifetime member PGPSW - time rapidly decreasing |
|
Back to top |
|
|
Tim Buxton Pocket GPS Moderator
Joined: 14/09/2002 20:56:18 Posts: 5231 Location: Surrey, United Kingdom
|
Posted: Wed Apr 06, 2005 10:35 am Post subject: |
|
|
I'd trust my GPS readout over the speedo in almost every instance (SA status notwithstanding). I have Cruise Control on my car and if I set it to 74mph, all of my GPS devices read 70mph. I've also timed myself along stretches of the M25 using the 100m markers and once again the GPS was just about spot on. I had to do this at 75mph (120kph) to make the maths easier though, so don't tell anyone. _________________ Tim |
|
Back to top |
|
|
ShirleyTemple Regular Visitor
Joined: Feb 11, 2005 Posts: 141 Location: Southampton/Portsmouth
|
Posted: Wed Apr 06, 2005 10:45 am Post subject: |
|
|
I was interested in reading you reply to that because I too noticed that my vehicle readouts were all about 5-7mph out when compared to the gps.
Hope the Speed Camera's agree. _________________ Navman iCN 520 |
|
Back to top |
|
|
Gee-Pee Lifetime Member
Joined: Feb 10, 2005 Posts: 1951 Location: Mostly somewhere in Essex
|
Posted: Wed Apr 06, 2005 2:14 pm Post subject: |
|
|
Tim Buxton wrote: | I'd trust my GPS readout over the speedo in almost every instance (SA status notwithstanding). I have Cruise Control on my car and if I set it to 74mph, all of my GPS devices read 70mph. I've also timed myself along stretches of the M25 using the 100m markers and once again the GPS was just about spot on. I had to do this at 75mph (120kph) to make the maths easier though, so don't tell anyone. |
Posed the same question to Navman Tech support and their answer is as follows - for general interest.
"The Navman reciever relays this info at 1 second intervals accurate to 0.1m p/sec which is about as accurate as it gets without using say F1 timing equipment"
I suggest Tim, that you carry a copy of this with you when you are stopped at 75mph on the largest car park in Europe! [/i] _________________ Gee-Pee
Lifetime member PGPSW - time rapidly decreasing |
|
Back to top |
|
|
Nigbo Regular Visitor
Joined: Feb 18, 2005 Posts: 82 Location: Manchester
|
Posted: Fri Apr 08, 2005 2:15 pm Post subject: |
|
|
How do I set my Navman 510 to give a speed reading - doesn't seem to address this in the handbook I have |
|
Back to top |
|
|
Tim Buxton Pocket GPS Moderator
Joined: 14/09/2002 20:56:18 Posts: 5231 Location: Surrey, United Kingdom
|
Posted: Fri Apr 08, 2005 2:47 pm Post subject: |
|
|
Nigbo wrote: | How do I set my Navman 510 to give a speed reading - doesn't seem to address this in the handbook I have |
You can only get a speed readout if you have set a route, unless you are on the GPS Status page. Have a look at P. 19 and beyond for how to get the speed readout. _________________ Tim |
|
Back to top |
|
|
Gee-Pee Lifetime Member
Joined: Feb 10, 2005 Posts: 1951 Location: Mostly somewhere in Essex
|
Posted: Fri Apr 08, 2005 2:59 pm Post subject: |
|
|
Tim Buxton wrote: | Nigbo wrote: | How do I set my Navman 510 to give a speed reading - doesn't seem to address this in the handbook I have |
You can only get a speed readout if you have set a route, unless you are on the GPS Status page. Have a look at P. 19 and beyond for how to get the speed readout. |
With the greatest respect to our Moderator, Tim, I think you can get a speed readout on the Navman without having a route set. In this state, you can get a compass bearing, time and speed. However, you cannot get an average speed without a route being set.
Correct me if i'm wrong. 8O _________________ Gee-Pee
Lifetime member PGPSW - time rapidly decreasing |
|
Back to top |
|
|
Tim Buxton Pocket GPS Moderator
Joined: 14/09/2002 20:56:18 Posts: 5231 Location: Surrey, United Kingdom
|
Posted: Fri Apr 08, 2005 3:23 pm Post subject: |
|
|
Gee-Pee wrote: | Tim Buxton wrote: | You can only get a speed readout if you have set a route, unless you are on the GPS Status page. Have a look at P. 19 and beyond for how to get the speed readout. |
With the greatest respect to our Moderator, Tim, I think you can get a speed readout on the Navman without having a route set. In this state, you can get a compass bearing, time and speed. However, you cannot get an average speed without a route being set.
Correct me if i'm wrong. 8O |
Note my "unless you are on the GPS Status page" proviso. This is where you get the information you state above, along with Lat/Long position. You can also get this from the Satellite Signal Strenghts page but, since this page is accessed from the GPS Status page, I ignored it. I suspect that what Nigbo really wants is how to get the speed displayed on a map page without a route set and I don't think that is possible. _________________ Tim |
|
Back to top |
|
|
Nigbo Regular Visitor
Joined: Feb 18, 2005 Posts: 82 Location: Manchester
|
Posted: Fri Apr 08, 2005 3:27 pm Post subject: |
|
|
my question is simple - I have seen pictures of map display, showing current speed in bottom right corner. How do i get to set the speed? All i have in this spot is an eta for arrival at destination |
|
Back to top |
|
|
Tim Buxton Pocket GPS Moderator
Joined: 14/09/2002 20:56:18 Posts: 5231 Location: Surrey, United Kingdom
|
Posted: Fri Apr 08, 2005 3:35 pm Post subject: |
|
|
Tap the readout that you have. It cycles through various options, speed being one of them. _________________ Tim |
|
Back to top |
|
|
Nigbo Regular Visitor
Joined: Feb 18, 2005 Posts: 82 Location: Manchester
|
Posted: Fri Apr 08, 2005 3:39 pm Post subject: |
|
|
Ta Tim - that's exactly wot I'm looking for - so for a thicko like me - I take it I just tap the eta time and pick an option? |
|
Back to top |
|
|
Tim Buxton Pocket GPS Moderator
Joined: 14/09/2002 20:56:18 Posts: 5231 Location: Surrey, United Kingdom
|
Posted: Fri Apr 08, 2005 3:44 pm Post subject: |
|
|
Tapping that corner of the display scrolls through the options. Again, P. 19 of the .pdf manual explains this. You must have a route selected to view these options. _________________ Tim |
|
Back to top |
|
|
Nigbo Regular Visitor
Joined: Feb 18, 2005 Posts: 82 Location: Manchester
|
Posted: Fri Apr 08, 2005 3:46 pm Post subject: |
|
|
cheers m8 - sorted. pity they didn't spot thickos like me wud be using their gear |
|
Back to top |
|
|
Tim Buxton Pocket GPS Moderator
Joined: 14/09/2002 20:56:18 Posts: 5231 Location: Surrey, United Kingdom
|
Posted: Fri Apr 08, 2005 3:47 pm Post subject: |
|
|
That's why we're here! Gives us something to do. _________________ Tim |
|
Back to top |
|
|
Nigbo Regular Visitor
Joined: Feb 18, 2005 Posts: 82 Location: Manchester
|
Posted: Fri Apr 08, 2005 3:55 pm Post subject: |
|
|
once again ta muchly - ps I have a 900cc Triumph Adventurer for really sunny days - bit cold at mo tho - stick to my Jeep |
|
Back to top |
|
|
|
Posted: Today Post subject: Pocket GPS Advertising |
|
|
We see you’re using an ad-blocker. We’re fine with that and won’t stop you visiting the site.
Have you considered making a donation towards website running costs?. Or you could disable your ad-blocker for this site. We think you’ll find our adverts are not overbearing!
|
|
Back to top |
|
|
|